export function identity2d(){
  return [
    1,0,
    0,1
  ]
}

export function identity3d(){
  return [
    1,0,0,
    0,1,0,
    0,0,1
  ]
}

export function identity4d(){
  return [
    1,0,0,0,
    0,1,0,0,
    0,0,1,0,
    0,0,0,1
  ]
}

